sm- 



LRJUGATION 



ORDINARY 



SUB- 



mnroATioM 



O-RdJMAW 



5UB- 



mniGATFon 



OPDIMARY 



Fig. 12. Effect of Subikrigation on 

 Lettuce. 



a. Boston curled, b. Frankford head (a-c after 

 Rane, F. W.). 



